Daikin R407C PLUS - Part 4 Test Operation R407 C PLUS Series Heat Recovery System; 1. Test Operation; 1.11 Backup and Emergency Operation

Outline of Control (Outdoor Unit) < Symbols using in this manual > Si33-105
92 Function R407C PLUS Series Heat Recovery System
Defrosting operation
The defrosting operation provides the following control functions
"
1
Opening degree of indoor unit EV during defrosting operation
• Initial value: 500
• Next indoor unit EV opening degree (200 – 2000) is determined based on (Th7 – Te < 15)
appearing time in previous defrosting operation
0 minute
→
+100
Less than 3 minutes
→
+0
3 minutes or more
→
–100
"
2 Refer to p.84 .
(V0807)
PI control
All indoor EV 1000pls (50 sec) → 0pls (10 sec) → End of preparation operation to 4-way valve
changeover → 50pls (10 sec H 10)
Control SH
according to
H 4
EV1, EV2 (main unit) = 0pls, EV3 (sub unit) = 2000pls
Normal control
PI control
52Hz+OFF
+(OFF)
29Hz+OFF
+(OFF)
[B]
[A]
[E]
H 9
H 3
H 2
H 2
H 2
( H 10)
( H 1)
SC
control
SH
control
SC control
Normal control Normal control
Instruction
cancel
Instruction
cancel
200pls
200pls
( H 10)
( H 7)
( H 8)
( H 10)
( H 1)
INV
SVP
Outdoor EV
Indoor EV
(Heating unit)
Indoor EV
(Cooling unit)
Outdoor fan
20S1
20S2
20RL
20RH
20RT
Defrost
preparation flag
Defrost
IN
BS unit
changeover
Defrost
OUT
1 min 1 min
Oil return, defrost
preparing signal
output
10 sec
Defrost
Discharge
Suction
Accumulator
discharge
operation
10 sec 10 sec 40 sec30 sec(7 min)
2 min
50 sec
20S3
SVRVG
BS unit
solenoid valve
50 sec
10 sec
2000pls only for sub unit side EV after 1 min from preparation